refactor(session): nuke dead sessionParams / sessionDisplayId pipeline (v43)

These columns and the messages that plumbed them existed for the CLI-
adapter era — Gemini's resume id and provider-specific session params
rode the run-finished envelope back onto the session row so the next
turn could resume. Pi Mono dispatches every provider through pi-ai and
emits neither value. The worker has been posting literal null on every
finish, finalizeRun has been writing null into task_sessions, and
rotateSession has been carrying null forward.

Remove the wire, the writer, the carry-forward, and the columns:

  - v43 migration rebuilds task_sessions without session_params_json /
    session_display_id, and runs without session_display_id. Follows
    the idempotent "create new, copy, swap, reindex" pattern used by
    v41. context_snapshot_json is preserved (also unreferenced today
    but outside this cleanup's scope).
  - RunJob / EnqueueRunPayload / ChildMessage / worker-types zod
    schema no longer carry the fields. finishRun() / createNewSession()
    signatures tighten in lockstep.
  - rotateSession starts the new session with fresh counters and no
    carry-forward.
  - turn-context resolveSession returns just the session id.
  - TaskSessionRecord / RunRecord lose the dead fields.

498/498 unit tests pass. typecheck + build clean.

src/main/database-base.ts

@@ -339,11 +339,10 @@ export class AppDatabaseBase {
   saveTask(input: { id?: string | null; companyId: string; projectId?: string | null; goalId?: string | null; parentId?: string | null; title: string; description: string; assigneeAgentId?: string | null; workspaceId?: string | null; priority: string; status: string }) { return this.tasks.saveTask(input); }
   getTask(id: string) { return this.entityCrud.getTask(id); }
   deleteTask(id: string, companyId: string) { return this.tasks.deleteTask(id, companyId); }
-  updateSessionParams(sessionId: string, sessionParams: Record<string, unknown> | null, sessionDisplayId: string | null) { return this.tasks.updateSessionParams(sessionId, sessionParams, sessionDisplayId); }
   getSessionById(sessionId: string) { return this.tasks.getSessionById(sessionId); }
   incrementSessionUsage(sessionId: string, inputTokens: number, outputTokens: number, runId: string) { return this.tasks.incrementSessionUsage(sessionId, inputTokens, outputTokens, runId); }
   archiveSession(sessionId: string, reason: string, handoffMarkdown: string) { return this.tasks.archiveSession(sessionId, reason, handoffMarkdown); }
-  createNewSession(input: { companyId: string; agentId: string; adapterType: string; sessionParamsJson: string | null; sessionDisplayId: string | null }) { return this.tasks.createNewSession(input); }
+  createNewSession(input: { companyId: string; agentId: string; adapterType: string }) { return this.tasks.createNewSession(input); }
   ensureAgentSession(input: { agentId: string; companyId: string; adapterType: string }) { return this.tasks.ensureAgentSession(input); }
   setAgentSessionId(agentId: string, sessionId: string) { return this.tasks.setAgentSessionId(agentId, sessionId); }
   getRecentRunsForTask(taskId: string, limit: number) { return this.tasks.getRecentRunsForTask(taskId, limit); }
@@ -385,7 +384,7 @@ export class AppDatabaseBase {
   readRunLog(runId: string) { return this.runs.readRunLog(runId); }
   readRunLogChunk(runId: string, offset = 0, limit = 65_536) { return this.runs.readRunLogChunk(runId, offset, limit); }
   markRunStatus(runId: string, status: RunStatus, message: string) { return this.runs.markRunStatus(runId, status, message); }
-  finishRun(input: { runId: string; status: RunStatus; summary: string | null; errorMessage: string | null; exitCode: number | null; signal: string | null; model: string | null; sessionDisplayId: string | null; unattributedCost: boolean }) { return this.runs.finishRun(input); }
+  finishRun(input: { runId: string; status: RunStatus; summary: string | null; errorMessage: string | null; exitCode: number | null; signal: string | null; model: string | null; unattributedCost: boolean }) { return this.runs.finishRun(input); }
   recordCostEntry(input: { runId: string; companyId: string; agentId: string; taskId: string | null; connectorId: string; amountUsd: number | null; unattributed: boolean }) { return this.runs.recordCostEntry(input); }
   hasActiveRun(filter: { companyId: string; taskId?: string; agentId?: string }) { return this.runs.hasActiveRun(filter); }
   listQueuedRuns() { return this.runs.listQueuedRuns(); }

src/main/database/migrations/v43-v43.ts

@@ -0,0 +1,143 @@
+import log from "electron-log/main.js";
+import type { Migration, MigrationDeps } from "./types";
+import { columnExists, tableExists } from "./types";
+
+/**
+ * Drop the Pi Mono-dead session carry-forward columns.
+ *
+ * The `task_sessions.session_params_json` / `task_sessions.session_display_id`
+ * columns and the matching `runs.session_display_id` column were meaningful
+ * in the CLI-adapter era: Gemini's resume id and provider-specific session
+ * params rode the run-finished message back into the session row so the next
+ * turn could resume. Pi Mono dispatches every provider through `pi-ai` and
+ * emits neither value — the worker has been writing literal `null` on every
+ * finish and `rotateSession` has been carrying `null` forward.
+ *
+ * Three columns of unused storage plus a hot path that writes them every
+ * run. Drop them.
+ *
+ * The migration mirrors v41's "copy to new table, swap, reindex" shape —
+ * SQLite still has no multi-column `DROP COLUMN`, and the task_sessions
+ * index topology plus the runs secondary indexes need to be restored
+ * identically. `PRAGMA foreign_keys` is disabled across the swap window
+ * so child rows are not cascade-deleted mid-rebuild.
+ */
+export function createMigrationsV43V43(deps: MigrationDeps): Migration[] {
+  const { db } = deps;
+  return [
+    {
+      version: 43,
+      name: "drop_dead_pi_mono_session_columns",
+      fn: () => {
+        const sessionsHasDeadCols =
+          tableExists(db, "task_sessions") &&
+          (columnExists(db, "task_sessions", "session_params_json") ||
+            columnExists(db, "task_sessions", "session_display_id"));
+        const runsHasDeadCol =
+          tableExists(db, "runs") && columnExists(db, "runs", "session_display_id");
+
+        if (!sessionsHasDeadCols && !runsHasDeadCol) {
+          log.info("[migration v43] dead columns already absent; skipping");
+          return;
+        }
+
+        db.exec("PRAGMA foreign_keys = OFF");
+        try {
+          if (sessionsHasDeadCols) {
+            db.exec(`
+              CREATE TABLE task_sessions_new (
+                id TEXT PRIMARY KEY,
+                company_id TEXT NOT NULL,
+                agent_id TEXT NOT NULL,
+                adapter_type TEXT NOT NULL,
+                last_run_id TEXT,
+                last_error TEXT,
+                run_count INTEGER NOT NULL DEFAULT 0,
+                total_input_tokens INTEGER NOT NULL DEFAULT 0,
+                total_output_tokens INTEGER NOT NULL DEFAULT 0,
+                rotated_at TEXT,
+                rotation_reason TEXT,
+                handoff_markdown TEXT,
+                created_at TEXT NOT NULL,
+                updated_at TEXT NOT NULL
+              );
+              INSERT INTO task_sessions_new (
+                id, company_id, agent_id, adapter_type, last_run_id, last_error,
+                run_count, total_input_tokens, total_output_tokens, rotated_at,
+                rotation_reason, handoff_markdown, created_at, updated_at
+              )
+              SELECT
+                id, company_id, agent_id, adapter_type, last_run_id, last_error,
+                run_count, total_input_tokens, total_output_tokens, rotated_at,
+                rotation_reason, handoff_markdown, created_at, updated_at
+              FROM task_sessions;
+              DROP TABLE task_sessions;
+              ALTER TABLE task_sessions_new RENAME TO task_sessions;
+              CREATE INDEX IF NOT EXISTS idx_task_sessions_company_agent
+                ON task_sessions(company_id, agent_id, updated_at);
+              CREATE INDEX IF NOT EXISTS idx_task_sessions_lookup
+                ON task_sessions(company_id, agent_id, adapter_type);
+            `);
+            log.info("[migration v43] rebuilt task_sessions without session_params_json/session_display_id");
+          }
+
+          if (runsHasDeadCol) {
+            // v16-v25 added `context_snapshot_json`; it is unreferenced by
+            // production code today but the column exists on real databases
+            // and carries no policy against preservation. Keep it so this
+            // migration's blast radius stays exactly one column.
+            db.exec(`
+              CREATE TABLE runs_new (
+                id TEXT PRIMARY KEY,
+                company_id TEXT NOT NULL,
+                task_id TEXT,
+                agent_id TEXT NOT NULL,
+                workspace_id TEXT,
+                connector_id TEXT NOT NULL,
+                status TEXT NOT NULL,
+                summary TEXT NOT NULL,
+                error_message TEXT,
+                exit_code INTEGER,
+                signal TEXT,
+                model TEXT,
+                cost_usd REAL,
+                unattributed_cost INTEGER NOT NULL DEFAULT 0,
+                context_snapshot_json TEXT,
+                actor_type TEXT,
+                actor_id TEXT,
+                started_at TEXT,
+                finished_at TEXT,
+                log_path TEXT,
+                created_at TEXT NOT NULL,
+                updated_at TEXT NOT NULL
+              );
+              INSERT INTO runs_new (
+                id, company_id, task_id, agent_id, workspace_id, connector_id,
+                status, summary, error_message, exit_code, signal, model,
+                cost_usd, unattributed_cost, context_snapshot_json, actor_type,
+                actor_id, started_at, finished_at, log_path, created_at, updated_at
+              )
+              SELECT
+                id, company_id, task_id, agent_id, workspace_id, connector_id,
+                status, summary, error_message, exit_code, signal, model,
+                cost_usd, unattributed_cost, context_snapshot_json, actor_type,
+                actor_id, started_at, finished_at, log_path, created_at, updated_at
+              FROM runs;
+              DROP TABLE runs;
+              ALTER TABLE runs_new RENAME TO runs;
+              CREATE INDEX IF NOT EXISTS idx_runs_company ON runs(company_id);
+              CREATE INDEX IF NOT EXISTS idx_runs_task ON runs(task_id);
+              CREATE INDEX IF NOT EXISTS idx_runs_agent ON runs(agent_id);
+              CREATE INDEX IF NOT EXISTS idx_runs_company_status ON runs(company_id, status);
+              CREATE INDEX IF NOT EXISTS idx_runs_company_created_at ON runs(company_id, created_at DESC);
+              CREATE INDEX IF NOT EXISTS idx_runs_agent_created_at ON runs(agent_id, created_at DESC);
+            `);
+            log.info("[migration v43] rebuilt runs without session_display_id");
+          }
+        } finally {
+          db.exec("PRAGMA foreign_keys = ON");
+        }
+      },
+    },
+  ];
+}

src/main/database/runs.ts

@@ -24,7 +24,7 @@ export function buildRunMethods(
     getRun(id: string): RunRecord {
       const row = getDb()
         .prepare(
-          "select id, company_id as companyId, task_id as taskId, agent_id as agentId, workspace_id as workspaceId, connector_id as connectorId, status, summary, error_message as errorMessage, exit_code as exitCode, signal, model, session_display_id as sessionDisplayId, cost_usd as costUsd, unattributed_cost as unattributedCost, started_at as startedAt, finished_at as finishedAt, log_path as logPath, created_at as createdAt, updated_at as updatedAt from runs where id = ?",
+          "select id, company_id as companyId, task_id as taskId, agent_id as agentId, workspace_id as workspaceId, connector_id as connectorId, status, summary, error_message as errorMessage, exit_code as exitCode, signal, model, cost_usd as costUsd, unattributed_cost as unattributedCost, started_at as startedAt, finished_at as finishedAt, log_path as logPath, created_at as createdAt, updated_at as updatedAt from runs where id = ?",
         )
         .get(id) as RunRecord | undefined;
       if (!row) throw new Error(`Run not found: ${id}`);
@@ -93,7 +93,6 @@ export function buildRunMethods(
       exitCode: number | null;
       signal: string | null;
       model: string | null;
-      sessionDisplayId: string | null;
       unattributedCost: boolean;
     }) {
       const run = getDb().prepare("select task_id as taskId, agent_id as agentId, company_id as companyId, connector_id as connectorId, started_at as startedAt from runs where id = ?").get(input.runId) as
@@ -134,11 +133,11 @@ export function buildRunMethods(
       transaction(() => {
         getDb()
           .prepare(
-            "update runs set status = ?, summary = ?, error_message = ?, exit_code = ?, signal = ?, model = ?, session_display_id = ?, cost_usd = ?, unattributed_cost = ?, finished_at = ?, updated_at = ? where id = ?",
+            "update runs set status = ?, summary = ?, error_message = ?, exit_code = ?, signal = ?, model = ?, cost_usd = ?, unattributed_cost = ?, finished_at = ?, updated_at = ? where id = ?",
           )
           .run(
             input.status, input.summary ?? "", input.errorMessage, input.exitCode,
-            input.signal, input.model, input.sessionDisplayId, runCostUsd,
+            input.signal, input.model, runCostUsd,
             input.unattributedCost ? 1 : 0, ts, ts, input.runId,
           );
         if (run.taskId !== null) {
@@ -201,7 +200,7 @@ export function buildRunMethods(
       const ts = nowIso();
       getDb()
         .prepare(
-          "update runs set status = 'cancelled', summary = ?, error_message = null, exit_code = null, signal = null, model = null, session_display_id = null, cost_usd = null, unattributed_cost = 1, finished_at = ?, updated_at = ? where id = ?",
+          "update runs set status = 'cancelled', summary = ?, error_message = null, exit_code = null, signal = null, model = null, cost_usd = null, unattributed_cost = 1, finished_at = ?, updated_at = ? where id = ?",
         )
         .run(summary, ts, ts, runId);
       if (taskId !== null) {
@@ -242,7 +241,7 @@ export function buildRunMethods(
       return readAll<RunRecord>(
         `select id, company_id as companyId, task_id as taskId, agent_id as agentId, workspace_id as workspaceId,
                 connector_id as connectorId, status, summary, error_message as errorMessage, exit_code as exitCode,
-                signal, model, session_display_id as sessionDisplayId, cost_usd as costUsd,
+                signal, model, cost_usd as costUsd,
                 unattributed_cost as unattributedCost, started_at as startedAt, finished_at as finishedAt,
                 log_path as logPath, created_at as createdAt, updated_at as updatedAt
            from runs

src/main/database/schema.ts

@@ -7,6 +7,7 @@ import { createMigrationsV38V39 } from "./migrations/v38-v39";
 import { createMigrationsV40V40 } from "./migrations/v40-v40";
 import { createMigrationsV41V41 } from "./migrations/v41-v41";
 import { createMigrationsV42V42 } from "./migrations/v42-v42";
+import { createMigrationsV43V43 } from "./migrations/v43-v43";
 import {
   columnExists,
   nowIso,
@@ -180,6 +181,7 @@ export function runMigrations(
     ...createMigrationsV40V40(deps),
     ...createMigrationsV41V41(deps),
     ...createMigrationsV42V42(deps),
+    ...createMigrationsV43V43(deps),
   ];
 
   for (const migration of migrations) {

src/main/database/snapshot.ts

@@ -83,7 +83,7 @@ export function buildSnapshotMethods(
         ...companyArgs,
       ),
       runs: readAll<RunRecord>(
-        `select id, company_id as companyId, task_id as taskId, agent_id as agentId, workspace_id as workspaceId, connector_id as connectorId, status, summary, error_message as errorMessage, exit_code as exitCode, signal, model, session_display_id as sessionDisplayId, cost_usd as costUsd, unattributed_cost as unattributedCost, started_at as startedAt, finished_at as finishedAt, log_path as logPath, created_at as createdAt, updated_at as updatedAt from runs${companyWhere} order by created_at desc limit ${companyId ? 2000 : 2000}`,
+        `select id, company_id as companyId, task_id as taskId, agent_id as agentId, workspace_id as workspaceId, connector_id as connectorId, status, summary, error_message as errorMessage, exit_code as exitCode, signal, model, cost_usd as costUsd, unattributed_cost as unattributedCost, started_at as startedAt, finished_at as finishedAt, log_path as logPath, created_at as createdAt, updated_at as updatedAt from runs${companyWhere} order by created_at desc limit ${companyId ? 2000 : 2000}`,
         ...companyArgs,
       ).map((record) => ({ ...record, unattributedCost: Boolean(record.unattributedCost) })) as RunRecord[],
       costs: readAll<CostRecord>(

src/main/database/task-sessions-crud.ts

@@ -17,25 +17,6 @@ export function buildTaskSessionMethods(
   transaction: Transaction,
 ) {
   return {
-    /**
-     * Stamp pi-ai's transient per-turn state (session resume params,
-     * display id) onto the given agent session row. Called by the
-     * worker's run-finished handler with `event.taskSessionId`.
-     */
-    updateSessionParams(
-      sessionId: string,
-      sessionParams: Record<string, unknown> | null,
-      sessionDisplayId: string | null,
-    ): void {
-      const ts = nowIso();
-      const sessionParamsJson = sessionParams ? JSON.stringify(sessionParams) : null;
-      getDb()
-        .prepare(
-          "update task_sessions set session_params_json = ?, session_display_id = ?, updated_at = ? where id = ?",
-        )
-        .run(sessionParamsJson, sessionDisplayId, ts, sessionId);
-    },
-
     /**
      * Fetch a session by its primary key. This is the single lookup
      * path — the rotation evaluator, the worker's finalizer, and the
@@ -48,8 +29,7 @@ export function buildTaskSessionMethods(
         (getDb()
           .prepare(
             `SELECT id, company_id as companyId, agent_id as agentId,
-       adapter_type as adapterType, session_params_json as sessionParamsJson,
-       session_display_id as sessionDisplayId, last_run_id as lastRunId,
+       adapter_type as adapterType, last_run_id as lastRunId,
        last_error as lastError, run_count as runCount,
        total_input_tokens as totalInputTokens, total_output_tokens as totalOutputTokens,
        rotated_at as rotatedAt, rotation_reason as rotationReason,
@@ -111,9 +91,8 @@ export function buildTaskSessionMethods(
         getDb()
           .prepare(
             `INSERT INTO task_sessions (id, company_id, agent_id, adapter_type,
-              session_params_json, session_display_id, run_count, total_input_tokens,
-              total_output_tokens, created_at, updated_at)
-             VALUES (?, ?, ?, ?, NULL, NULL, 0, 0, 0, ?, ?)`,
+              run_count, total_input_tokens, total_output_tokens, created_at, updated_at)
+             VALUES (?, ?, ?, ?, 0, 0, 0, ?, ?)`,
           )
           .run(sessionId, input.companyId, input.agentId, input.adapterType, ts, ts);
         getDb()
@@ -132,34 +111,22 @@ export function buildTaskSessionMethods(
 
     /**
      * Create a replacement session row after rotation. Inherits the
-     * agent / company / adapter type from the caller; session params
-     * and display id carry forward so the next pi-ai turn can resume.
+     * agent / company / adapter type from the caller. Counters start
+     * at zero — Pi Mono has no per-turn provider state to carry forward.
      */
     createNewSession(input: {
       companyId: string;
       agentId: string;
       adapterType: string;
-      sessionParamsJson: string | null;
-      sessionDisplayId: string | null;
     }): string {
       const sessionId = randomUUID();
       const ts = nowIso();
       getDb()
         .prepare(
-          `INSERT INTO task_sessions (id, company_id, agent_id, adapter_type,
-       session_params_json, session_display_id, created_at, updated_at)
-       VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+          `INSERT INTO task_sessions (id, company_id, agent_id, adapter_type, created_at, updated_at)
+           VALUES (?, ?, ?, ?, ?, ?)`,
         )
-        .run(
-          sessionId,
-          input.companyId,
-          input.agentId,
-          input.adapterType,
-          input.sessionParamsJson,
-          input.sessionDisplayId,
-          ts,
-          ts,
-        );
+        .run(sessionId, input.companyId, input.agentId, input.adapterType, ts, ts);
       return sessionId;
     },
   };

src/main/orchestration/run-dispatch.ts

@@ -91,7 +91,6 @@ export function createRunDispatch(deps: OrchestrationDependencies) {
         exitCode: null,
         signal: null,
         model: null,
-        sessionDisplayId: null,
         unattributedCost: true,
       });
       return;

src/main/orchestration/task-runner.ts

@@ -196,7 +196,6 @@ export function createTaskRunner(
               exitCode: null,
               signal: null,
               model: null,
-              sessionDisplayId: null,
               unattributedCost: true,
             });
             db.addActivity({

src/main/orchestration/turn-context.ts

@@ -141,7 +141,6 @@ function resolveEnabledConnectorModels(
 function resolveSession(
   db: AppDatabase,
   agent: RunDispatchParams["agent"],
-  task: RunDispatchParams["task"],
   companyId: string,
   connectorId: string,
   sessionHandoff: string | null,
@@ -172,23 +171,8 @@ function resolveSession(
     }
   }
 
-  // `sessionParams` / `sessionDisplayId` are transient per-run state pi-ai
-  // stamps onto the session row after a turn (e.g., Gemini's resume id).
-  // They live on the agent session; read directly by session id.
-  let sessionParams: Record<string, unknown> | null = null;
-  let sessionDisplayId: string | null = null;
-  const currentSession = db.getSessionById(currentSessionId);
-  if (currentSession?.sessionParamsJson) {
-    sessionParams = JSON.parse(currentSession.sessionParamsJson) as Record<string, unknown>;
-    sessionDisplayId = currentSession.sessionDisplayId;
-  }
-  // Suppress the unused-parameter warning while keeping the signature
-  // stable — task identity is reported through other fields on the
-  // payload, not through the session row anymore.
-  void task;
-
   return {
-    taskSession: { id: currentSessionId, sessionParams, sessionDisplayId },
+    taskSessionId: currentSessionId,
     sessionHandoff: finalHandoff,
   };
 }
@@ -292,7 +276,7 @@ export function buildRunPayload(params: RunDispatchParams, deps: TurnContextDeps
   const reviewTasks = db.listReviewTasksForManager(agent.id, companyId);
   const recentComments = assembleRecentComments(assignedTasks, reviewTasks, snapshot);
   const initialHandoff = resolveSessionHandoff(agent.id, deps);
-  const { taskSession, sessionHandoff } = resolveSession(db, agent, task, companyId, connector.id, initialHandoff, deps);
+  const { taskSessionId, sessionHandoff } = resolveSession(db, agent, companyId, connector.id, initialHandoff, deps);
   const skills = resolveSkills(companyId, agent.id, connector.id, agent.name, deps);
 
   const systemPrompt = apiUrl ? buildTaskPrompt({
@@ -363,10 +347,9 @@ export function buildRunPayload(params: RunDispatchParams, deps: TurnContextDeps
     model: modelSelection.effectiveModel,
     thinkingEffort,
     env,
-    sessionParams: taskSession.sessionParams,
     systemPrompt,
     trigger,
-    taskSessionId: taskSession.id ?? runId,
+    taskSessionId: taskSessionId ?? runId,
     executionMode: db.getCompanyExecutionMode(companyId) as "ai_ceo" | "ai_cofounder",
   };
 }

src/main/orchestration/types.ts

@@ -40,7 +40,6 @@ export interface EnqueueRunPayload {
   model: string | null;
   thinkingEffort: string | null;
   env: Record<string, string>;
-  sessionParams: Record<string, unknown> | null;
   systemPrompt: string | null;
   trigger: string | null;
   /** Task session id used by SqliteSessionStore to load/append messages. */

src/main/session-management-service.ts

@@ -136,28 +136,22 @@ export function createSessionManagementService({ db, logger }: SessionManagement
   }
 
   // Archive current session, generate handoff, create new agent-scoped
-  // session, update the agent pointer and any task active-session pointers
-  // still referencing the old session.
+  // session, update the agent pointer. Counters reset; Pi Mono carries no
+  // provider-side resume state across rotations.
   function rotateSession(session: TaskSessionRecord): string {
     const reason = "threshold_exceeded";
     const handoff = generateHandoff(session);
 
     logger.info(`[session] Rotating session ${session.id} for agent ${session.agentId}: ${reason}`);
 
-    // 1. Archive old session
     db.archiveSession(session.id, reason, handoff);
 
-    // 2. Create new session row with fresh counters, carry forward
-    //    session_params so pi-ai can resume.
     const newSessionId = db.createNewSession({
       companyId: session.companyId,
       agentId: session.agentId,
       adapterType: session.adapterType,
-      sessionParamsJson: session.sessionParamsJson,
-      sessionDisplayId: session.sessionDisplayId,
     });
 
-    // 3. Point the agent at the freshly-minted session.
     db.setAgentSessionId(session.agentId, newSessionId);
 
     logger.info(`[session] New session ${newSessionId} created for agent ${session.agentId}`);

src/main/worker-service.ts

@@ -176,7 +176,6 @@ export function createWorkerService({
             exitCode: null,
             signal: null,
             model: null,
-            sessionDisplayId: null,
             unattributedCost: true,
           });
           if (run.workspaceId) {

src/main/worker/handlers/run-finished-helpers.ts

@@ -47,7 +47,6 @@ export function finalizeRun(
       exitCode: event.exitCode,
       signal: event.signal,
       model: event.model,
-      sessionDisplayId: event.sessionDisplayId,
       unattributedCost: event.unattributedCost,
       inputTokens: event.inputTokens,
       outputTokens: event.outputTokens,
@@ -66,21 +65,6 @@ export function finalizeRun(
     }
   }
 
-  // Stamp pi-ai's transient per-turn state (session resume params,
-  // display id) onto the agent's current session row. Sessions are
-  // agent-scoped, so the session id comes from agents.session_id —
-  // not from a task pointer (that indirection was dropped in v41).
-  try {
-    const agent = db.getAgent(run.agentId);
-    if (agent.sessionId) {
-      db.updateSessionParams(agent.sessionId, event.sessionParams, event.sessionDisplayId ?? null);
-    }
-  } catch (error) {
-    logger.warn(
-      `[finalizeRun] updateSessionParams failed for run ${event.runId}: ${error instanceof Error ? error.message : String(error)}`,
-    );
-  }
-
   leaseRenewalMap.delete(event.runId);
   const runOutcome = db.finishRun(event);
   if (run.workspaceId) {

src/main/worker/worker-crash-recovery.ts

@@ -41,7 +41,6 @@ export function handleWorkerExit(
         exitCode: code,
         signal: null,
         model: null,
-        sessionDisplayId: null,
         unattributedCost: true,
       });
       if (run.workspaceId) {
@@ -128,7 +127,6 @@ export function handleWorkerExit(
           exitCode: null,
           signal: null,
           model: null,
-          sessionDisplayId: null,
           unattributedCost: true,
         });
         if (candidate.workspaceId) {

src/main/worker/worker-entry.ts

@@ -107,8 +107,6 @@ function cancelRun(runId: string) {
       exitCode: null,
       signal: null,
       model: null,
-      sessionParams: null,
-      sessionDisplayId: null,
       unattributedCost: true,
       inputTokens: null,
       outputTokens: null,

src/main/worker/worker-helpers.ts

@@ -16,7 +16,6 @@ export interface RunJob {
   model: string | null;
   thinkingEffort: string | null;
   env: Record<string, string>;
-  sessionParams: Record<string, unknown> | null;
   systemPrompt: string | null;
   trigger: string | null;
   taskSessionId: string;
@@ -41,8 +40,6 @@ export type ChildMessage =
       exitCode: number | null;
       signal: string | null;
       model: string | null;
-      sessionParams: Record<string, unknown> | null;
-      sessionDisplayId: string | null;
       unattributedCost: boolean;
       inputTokens: number | null;
       outputTokens: number | null;

src/main/worker/worker-runner.ts

@@ -194,8 +194,6 @@ export class WorkerRunner {
       exitCode: null,
       signal: null,
       model: resolvedModelId,
-      sessionParams: job.sessionParams,
-      sessionDisplayId: null,
       // Worker no longer owns cost attribution — CostWriter (main-side)
       // writes per-message rows, finishRun sums them. This flag stays true
       // only for run paths that never had a chance to emit usage (errors

src/main/worker/worker-types.ts

@@ -30,8 +30,6 @@ export const workerMessageSchema = z.union([
     exitCode: z.number().int().nullable(),
     signal: z.string().nullable(),
     model: z.string().nullable(),
-    sessionParams: z.record(z.string(), z.unknown()).nullable(),
-    sessionDisplayId: z.string().nullable(),
     unattributedCost: z.boolean(),
     inputTokens: z.number().nullable(),
     outputTokens: z.number().nullable(),

src/shared/types/records-core.ts

@@ -192,7 +192,6 @@ export interface RunRecord {
   exitCode: number | null;
   signal: string | null;
   model: string | null;
-  sessionDisplayId: string | null;
   costUsd: number | null;
   unattributedCost: boolean;
   startedAt: string | null;
@@ -275,8 +274,6 @@ export interface TaskSessionRecord {
   companyId: string;
   agentId: string;
   adapterType: string;
-  sessionParamsJson: string | null;
-  sessionDisplayId: string | null;
   lastRunId: string | null;
   lastError: string | null;
   runCount: number;

tests/integration/agent-model-switching.spec.ts

@@ -134,7 +134,6 @@ describe("agent model switching", () => {
       exitCode: 0,
       signal: null,
       model: "gpt-5.4",
-      sessionDisplayId: null,
       unattributedCost: true,
     });
 

tests/integration/autonomous-chain/crash-recovery.spec.ts

@@ -80,7 +80,6 @@ describe("Step 7: Worker crash recovery (database layer)", () => {
       exitCode: 1,
       signal: null,
       model: null,
-      sessionDisplayId: null,
       unattributedCost: true,
     });
 

tests/integration/autonomous-chain/run-failure.spec.ts

@@ -40,7 +40,6 @@ describe("Step 6: Run failure escalation (database layer)", () => {
       exitCode: 1,
       signal: null,
       model: "gpt-5-codex",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 

tests/integration/cross-subsystem.spec.ts

@@ -217,7 +217,6 @@ describe("Cross-Subsystem Pipeline (D-04)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-2.5-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -226,8 +225,6 @@ describe("Cross-Subsystem Pipeline (D-04)", () => {
       companyId: s.companyId,
       agentId: s.agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
     sessionService.accumulateTokenUsage(sessionId, 5000, 2000, runId);
 
@@ -344,7 +341,6 @@ describe("Cross-Subsystem Pipeline (D-04)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-2.5-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -383,8 +379,6 @@ describe("Cross-Subsystem Pipeline (D-04)", () => {
       companyId: s.companyId,
       agentId: s.agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     // Run 1: create run and accumulate tokens
@@ -456,7 +450,6 @@ describe("Cross-Subsystem Pipeline (D-04)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-2.5-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -498,7 +491,6 @@ describe("Cross-Subsystem Pipeline (D-04)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-2.5-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 

tests/integration/database.spec.ts

@@ -133,7 +133,6 @@ describe("AppDatabase", () => {
       exitCode: 0,
       signal: null,
       model: "gpt-5-codex",
-      sessionDisplayId: "session-1",
       unattributedCost: false,
     });
 

tests/integration/process-recovery.spec.ts

@@ -444,8 +444,6 @@ describe("Process Recovery -- Context Preservation (D-02)", () => {
       companyId: s.companyId,
       agentId: s.agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     // Add token usage to simulate real work

tests/unit/atomic-checkout.test.ts

@@ -196,7 +196,6 @@ describe("CAS checkout", () => {
       exitCode: 0,
       signal: null,
       model: null,
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -337,7 +336,6 @@ describe("CAS checkout", () => {
       exitCode: null,
       signal: null,
       model: null,
-      sessionDisplayId: null,
       unattributedCost: true,
     });
 
@@ -382,7 +380,6 @@ describe("CAS checkout", () => {
       exitCode: null,
       signal: null,
       model: null,
-      sessionDisplayId: null,
       unattributedCost: true,
     });
 
@@ -417,7 +414,6 @@ describe("CAS checkout", () => {
       exitCode: 1,
       signal: null,
       model: null,
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 

tests/unit/dashboard-charts.test.ts

@@ -27,7 +27,6 @@ function makeRun(overrides: Partial<RunRecord> = {}): RunRecord {
     exitCode: null,
     signal: null,
     model: null,
-    sessionDisplayId: null,
     costUsd: null,
     unattributedCost: false,
     startedAt: null,

tests/unit/database.test.ts

@@ -296,7 +296,6 @@ describe("AppDatabase", () => {
       exitCode: 0,
       signal: null,
       model: "gpt-5",
-      sessionDisplayId: "session-budget",
       unattributedCost: false,
     });
 
@@ -515,7 +514,6 @@ describe("AppDatabase", () => {
       exitCode: 0,
       signal: null,
       model: null,
-      sessionDisplayId: null,
       unattributedCost: true,
     });
 

tests/unit/edge-case-budget.test.ts

@@ -167,7 +167,6 @@ describe("Edge Case: Budget Exhaustion Mid-Run (D-05.2)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -182,7 +181,6 @@ describe("Edge Case: Budget Exhaustion Mid-Run (D-05.2)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -234,7 +232,6 @@ describe("Edge Case: Budget Exhaustion Mid-Run (D-05.2)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -283,7 +280,6 @@ describe("Edge Case: Budget Exhaustion Mid-Run (D-05.2)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -341,7 +337,6 @@ describe("Edge Case: Budget Exhaustion Mid-Run (D-05.2)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -394,7 +389,6 @@ describe("Edge Case: Budget Exhaustion Mid-Run (D-05.2)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -443,7 +437,6 @@ describe("Edge Case: Budget Exhaustion Mid-Run (D-05.2)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 

tests/unit/edge-case-session.test.ts

@@ -118,8 +118,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       companyId,
       agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     // Simulate runs until we reach the maxRuns threshold (20)
@@ -146,8 +144,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       companyId,
       agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     // Accumulate tokens past the threshold in one big call
@@ -172,8 +168,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       companyId,
       agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     // Accumulate enough to trigger rotation
@@ -197,7 +191,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -229,8 +222,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       companyId,
       agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: JSON.stringify({ resumeKey: "abc" }),
-      sessionDisplayId: "gemini-session-1",
     });
 
     // Add usage to the old session
@@ -244,8 +235,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       companyId,
       agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: JSON.stringify({ resumeKey: "abc" }),
-      sessionDisplayId: "gemini-session-2",
     });
 
     // Get the new active session
@@ -268,8 +257,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       companyId,
       agentId,
       adapterType: "claude-pro",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     // Accumulate way past all thresholds
@@ -292,8 +279,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       companyId,
       agentId,
       adapterType: "openai-codex",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     // Accumulate way past all thresholds
@@ -317,8 +302,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       companyId,
       agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
     db.incrementSessionUsage(sessionId, 300000, 200000, "run-1");
 
@@ -338,7 +321,6 @@ describe("Edge Case: Session Rotation During Execution (D-05.3)", () => {
       exitCode: 0,
       signal: null,
       model: "gemini-pro",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 

tests/unit/session-management.test.ts

@@ -106,8 +106,6 @@ describe("task_sessions CRUD", () => {
       companyId,
       agentId,
       adapterType: "claude-pro",
-      sessionParamsJson: JSON.stringify({ sessionId: "abc123" }),
-      sessionDisplayId: "claude-abc123",
     });
 
     const session = db.getSessionById(sessionId);
@@ -116,8 +114,6 @@ describe("task_sessions CRUD", () => {
     expect(session!.companyId).toBe(companyId);
     expect(session!.agentId).toBe(agentId);
     expect(session!.adapterType).toBe("claude-pro");
-    expect(session!.sessionParamsJson).toBe(JSON.stringify({ sessionId: "abc123" }));
-    expect(session!.sessionDisplayId).toBe("claude-abc123");
     expect(session!.runCount).toBe(0);
     expect(session!.totalInputTokens).toBe(0);
     expect(session!.totalOutputTokens).toBe(0);
@@ -132,8 +128,6 @@ describe("task_sessions CRUD", () => {
       companyId,
       agentId,
       adapterType: "claude-pro",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     db.incrementSessionUsage(sessionId, 1000, 500, "run-001");
@@ -159,8 +153,6 @@ describe("task_sessions CRUD", () => {
       companyId,
       agentId,
       adapterType: "claude-pro",
-      sessionParamsJson: null,
-      sessionDisplayId: null,
     });
 
     db.archiveSession(sessionId, "max_runs", "# Handoff\nSession reached 20 runs.");
@@ -178,8 +170,6 @@ describe("task_sessions CRUD", () => {
       companyId,
       agentId,
       adapterType: "gemini-cli",
-      sessionParamsJson: JSON.stringify({ key: "val" }),
-      sessionDisplayId: "gemini-session-1",
     });
 
     expect(typeof sessionId).toBe("string");
@@ -204,7 +194,6 @@ describe("task_sessions CRUD", () => {
       exitCode: 0,
       signal: null,
       model: "claude-4-opus",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -217,7 +206,6 @@ describe("task_sessions CRUD", () => {
       exitCode: 1,
       signal: null,
       model: "claude-4-opus",
-      sessionDisplayId: null,
       unattributedCost: false,
     });
 
@@ -292,8 +280,6 @@ describe("session management service", () => {
         companyId: "co-1",
         agentId: "agent-1",
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
         lastRunId: null,
         lastError: null,
         runCount: 5,
@@ -317,8 +303,6 @@ describe("session management service", () => {
         companyId: "co-1",
         agentId: "agent-1",
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
         lastRunId: null,
         lastError: null,
         runCount: 20,
@@ -342,8 +326,6 @@ describe("session management service", () => {
         companyId: "co-1",
         agentId: "agent-1",
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
         lastRunId: null,
         lastError: null,
         runCount: 3,
@@ -368,8 +350,6 @@ describe("session management service", () => {
         companyId: "co-1",
         agentId: "agent-1",
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
         lastRunId: null,
         lastError: null,
         runCount: 1,
@@ -398,8 +378,6 @@ describe("session management service", () => {
         companyId: "co-1",
         agentId: "agent-1",
         adapterType: "claude-pro",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
         lastRunId: null,
         lastError: null,
         runCount: 100, // Way over threshold
@@ -428,8 +406,6 @@ describe("session management service", () => {
         companyId: "co-1",
         agentId: "agent-1",
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
         lastRunId: null,
         lastError: null,
         runCount: 5,
@@ -453,8 +429,6 @@ describe("session management service", () => {
         companyId: "co-1",
         agentId: "agent-1",
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
         lastRunId: null,
         lastError: null,
         runCount: 10, // Below default 20
@@ -478,8 +452,6 @@ describe("session management service", () => {
         companyId: "co-1",
         agentId: "agent-1",
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
         lastRunId: null,
         lastError: null,
         runCount: 19, // Just below default 20
@@ -512,8 +484,6 @@ describe("session management service", () => {
         companyId,
         agentId,
         adapterType: "claude-pro",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
       });
       const svc = createSessionManagementService({ db, logger: mockLogger });
 
@@ -537,8 +507,6 @@ describe("session management service", () => {
         companyId,
         agentId,
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
       });
 
       // Create a completed run for history
@@ -551,7 +519,6 @@ describe("session management service", () => {
         exitCode: 0,
         signal: null,
         model: "gemini-pro",
-        sessionDisplayId: null,
         unattributedCost: false,
       });
 
@@ -584,8 +551,6 @@ describe("session management service", () => {
         companyId,
         agentId,
         adapterType: "gemini-cli",
-        sessionParamsJson: JSON.stringify({ resumeId: "old-abc" }),
-        sessionDisplayId: "gemini-old",
       });
 
       // Add some usage
@@ -606,14 +571,12 @@ describe("session management service", () => {
       expect(archivedRows[0].rotationReason).toBe("threshold_exceeded");
       expect(archivedRows[0].handoffMarkdown).toContain("# Session Handoff");
 
-      // New session is a distinct row, with fresh counters and copied params
+      // New session is a distinct row with fresh counters.
       const newSession = db.getSessionById(newSessionId)!;
       expect(newSession.id).toBe(newSessionId);
       expect(newSession.runCount).toBe(0);
       expect(newSession.totalInputTokens).toBe(0);
       expect(newSession.totalOutputTokens).toBe(0);
-      expect(newSession.sessionParamsJson).toBe(JSON.stringify({ resumeId: "old-abc" }));
-      expect(newSession.sessionDisplayId).toBe("gemini-old");
     });
   });
 
@@ -630,8 +593,6 @@ describe("session management service", () => {
         companyId,
         agentId,
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
       });
       db.incrementSessionUsage(session1Id, 100000, 50000, "run-1");
       const session1 = db.getSessionById(session1Id)!;
@@ -648,8 +609,6 @@ describe("session management service", () => {
         companyId,
         agentId,
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
       });
       const svc = createSessionManagementService({ db, logger: mockLogger });
 
@@ -668,8 +627,6 @@ describe("session management service", () => {
         companyId,
         agentId,
         adapterType: "gemini-cli",
-        sessionParamsJson: null,
-        sessionDisplayId: null,
       });
 
       // Pre-populate some usage

tests/unit/store.test.ts

@@ -270,7 +270,6 @@ const fakeTask = (id: string, title = "Task"): TaskRecord => ({
   priority: "medium",
   activeRunId: null,
   sessionJson: null,
-  sessionDisplayId: null,
   requiresUserReview: false,
   startedAt: null,
   completedAt: null,
@@ -292,7 +291,6 @@ const fakeRun = (id: string): RunRecord => ({
   exitCode: null,
   signal: null,
   model: null,
-  sessionDisplayId: null,
   unattributedCost: false,
   startedAt: null,
   finishedAt: null,